L’Oreal Paris Unbelieva-Brow Longwear Waterproof Tinted Brow Gel, Brunette, Brows for days. Enhanced up to 48 hours. Unbelievable-brow, L’Oreal Paris first long-wear brow gel, fills and thickens for brows that last. Build and sculpt your dream brow from natural to intense. Waterproof. No smudge. No transfer. Sweat-Resistant.